The cafe owner, Alex O’Brien, who describes herself as “a feminist, not the fun kind,” told Seven News that the gender tax is only added one week out of every month, and that it’s not compulsory. “If people aren’t comfortable paying it or if men don’t want to pay it, we’re not going to kick them out the door,” she said.

The 18 percent figure comes from a 2016 Australian government Workplace Gender Equality Agency report which showed women in Australia earn 82 percent of what men do on a yearly basis.

“I had a woman bring her daughters in today and when she came up to the till and saw our gorgeous vulva stones and our period sticker packs she beamed, thanked us for what we were doing and said ‘what a beautiful place to take my daughters,’” O’Brien wrote on Facebook. “We’ve had men travel across town to visit us and pay ‘the man tax’ and throw some extra in the donation jar – guys, you’re pretty neat.”